Joe Biden cheers new vaccine but cautions on Covid-19 variants

"Though we celebrate today’s news, I urge all Americans — keep washing your hands, stay socially distanced, and keep wearing masks," Biden said in a statement.

President Joe Biden cheered an announcement on Saturday that the US Food and Drug Administration has authorized Johnson & Johnson's single-dose Covid-19 vaccine, but cautioned Americans to not let their guard down as new variants spread.

US President Joe Biden before boarding Marine One on the South Lawn of the White House in Washington, DC, U.S, on Saturday. (Bloomberg Photo )

"Though we celebrate today’s news, I urge all Americans — keep washing your hands, stay socially distanced, and keep wearing masks," Biden said in a statement. "As I have said many times, things are still likely to get worse again as new variants spread, and the current improvement could reverse."